Improvement in telegraph apparatus



-HENRY VAN HOEVENBERGH, OF BROOKLYN, NEW YORK.

lMPRCVEMNT IN TELEGRAPH APPARATUS.

Specification forming part ofLetters Patent No. E, dated February l0, 1874; application filed August 1G, 18.72.

To all whom it may concern.:

Beit known that I, HENRY VAN HonvnN- BERGH, of Brooklyn, in the county of Kings and State of New York, have invented an lmprovement in Telegrapliic Call-Instruments,

of which the following is a specification z When a permanent magnet is in contact with the cores of an electro-magnet, said cores are magnetized by induction, andthe electric condition of said cores and the surrounding helices is so changed that if the contact between the permanent magnet and the cores is suddenly broken there will be a pulsation sent through the circuit of which the helices form part.

I avail of this electric operation to operate a call-instrument at a distant station, by mal;- ing the helices of an electro-magnet at the distant station part of the circuit of the electromagnet that is energized by the permanent magnet, and `I construct the mechanism of the call-instrument with reference to operating with a sudden feeble current, such as that induced in the foregoing manner.

ln the drawing, Figure l is a plan of the magnet at the one station,'and Fig. 2 is an elevation of the call-instrument at the other station.

The permanent magnet a is set to swing on the fulcrum b, and is provided with a handle or knob, o, which also should be fitted with an adjusting-screw to regulate the extent of motion. e e are the cores, around which are wound the helices ff, that are connected with the line-wires or line a-nd earth to the distant station, and at the call-instrument the helices ot' the electro-magnet h are in the metallic eircuit, and said magnet h is energized by suddenly separating a and e. The sudden contact of a and e will also send a pulsation to h,- but it is preferable to close gradually, so as not to induce asudden secondary current and depend upon breaking the contact between a and e suddenly to operate the distant instrunient. The armature k of the magnet h should be balanced so as to move freely, and it is preferable to employ a clock movcm ent to actuate the hammer l and strike the bell m. The clock movement a is of any desired character, and rotates the cam-wheel 0, and this eamwheel serves to set the armature 7.1, and the armature becomes a stop to the clock-work. rlwo fingers, r, upon an arm from the armature L are made with an opening between them for the edge ofthe cam-wheel o, and this cam-wheel o is eut open at one place with a mouth wide enough to allow one of the lingers to pass through, and such wheel is bent at one side of the mouth to form a cam, as represented in Fig. 3, so that when the arma ture isiattraeted by the electro-magnet h, the fingers are moved and allow the disk or wheel o to rotate between them, and at this time thecall is sounded, and in the latter portion of the revolution of the wheel o the cani moves the fingers 9^ into the position shown in Fig. 3, to stop the further rotation of the cam-wheel.

I do not .claim an electro-magnet attached to a permanent magnet in which the cores ot' the electro-magnet are energized by induction, and a movable armature used to break contact with the cores and incite a current in the helices. In this case the cores remain magnotie by induction. ln my instrument the cores and permanent magnet are separated, thereby increasing the action in the coil by the discharge of the magnetism ofthe cores.

I claim as my inventionl. The permanent magnet c, set to swing upon the fulerum b, and movable by the handle or knob, in combination with an electromagnet, the cores of which are magnetized by induction, and from which the permanent magnet is separated by the movement thereof, substanti-all y as set forth.

2. The cam-wheel o, fingers 1' 1, and armature k, in combination with the electro-magnet h, clock-work a, hammer l, and bell my, substantially as and for the purposes set forth.

Signed by me this 9th day of August, 1873.

HENRY VAN HOEVENBERGH.

Witnesses:

Guns. H. Sirrrn, GEO. T. PINGKNEY. 

